Scan a dynamodb table with aws4-tiny

scan-dynamodb-aws4-tiny.js

const credentials = {
    accessKeyId: "AKIA...",
    secretAccessKey: "...",
}

const region = 'eu-west-1'

async function dynamoDB(target, body) {
    const response = await aws4.fetch({
        service: 'dynamodb',
        region: region,
        path: '/',
        headers: {
            'X-Amz-Target': target,
            'Content-Type': 'application/x-amz-json-1.0'
        },
        body: JSON.stringify(body)
    }, credentials)
    if (!response.ok) {
        throw response
    }
    return await response.json()
}

// TODO: Use parallel scans if need to handle multi-MB responses
async function scanDynamoDB(scanOptions) {
    let items = [];
    let response = {};
    do {
        response = await dynamoDB('DynamoDB_20120810.Scan', {
            ...scanOptions,
            ...(response.LastEvaluatedKey && { ExclusiveStartKey: response.LastEvaluatedKey })
        });
        items.push(...response.Items);
    } while (response.LastEvaluatedKey);
    return items;
}